Drill pipe attachment



C. M. HOLDER Er AL DRILL PIPE ATTACHMENT sept. 1s, 1951 2 Sheets-Sheet l Filed March 8, 1950 IN VEN T ORS sept. 1s, 1951 QM. Hanan n A1. 568,00

nmz. PIPE ATTACHMENT I/VEM/ ,l l f\ ssm 2 H mw( u, s ,ll/MMM A 0r an 0 er 85 6l 0 el INVENTORS BY Mj:

Patented Sept. 18,? 1951 v 'artriirs nimmst' eli-ester Meiner and Mengen Heiden v miasung,'omaiV r persuasif/rares '8, 1956,' sereine. 148,428

^ l' V'"Iliis invention' relates to an aieclffent 'f' "any body slidabl'e in a pipe ortibe the 'prim l y object of which iste prev-ent the body from a'ckcidrentally dropping out of .the bottom edge of the tube.

In the art ofdrilling.,it-iscustornary to slide an instrument such as a carnervawor` recording niaic'i'ririe into'a "drill pipe; Should the-cables Carrying the instrument or the pipe 'break off -acfcie dentally the istrum'entwill-'ifall out' of the pipe. The present device has been designed andfconstructed to prevent this accidental falling out fo'fth'efi-nstrument. *y A A v -jAriother objectof the invention is toV provide a. device of the character described which is relatively simple in construction and assembly, easy to attach to a sliding body, and automatic in its operation.

Yet another object of the invention is to provide in combination with an object slidably positioned in a tube, a device for preventing the object from dropping out of the end of the tube comprising a cylindrical body, means for attaching the body to the object, tube gripping members carried by said body, resilient means normally urging said members outwardly of said body and into gripping engagement With the inner wall of the tube, and lever means operatively connected to said gripping members urging said members inwardly and out of gripping contact with said tube by Iengagement of said lever means with the inner wall of said tube.

These, together with various ancillary objects and features of the invention which will later become apparent as the following description proceeds, are attained by the device, a preferred embodiment of which has been illustrated by way of example only on the accompanying drawings, wherein:

Fig-ure 1 is a side elevational view of the device shownattached to an instrument in a drill pipe;

Figure 2 is a side elevational view of the device itself looking from the left on Figure 1;

Figure 3 is a View similar to Figure 1 showing the device in a sliding or inoperative position;

Figure 4 is a sectional View taken on the line 4-4 of Figure 5;

Figure 5 is a sectional view taken on the line `5---5 of Figure 4;

Figure 6 is a sectional view taken on the line 6 6 of Figure 4;

' Figure 7 is a sectional View taken on the line 1--1 of Figure 4; and

Figures 8 and 9 are perspective views of the levers for actuating the grips.

4 Claims: (Cll- 255:11

'In the several viewsY the accompanying dr specific reference-snow made1;` "'t'1'1e drawings@ mi n the following specinbauen refe nY f "cter'sl Yi'ridica't'e corresponding 'elements 'throughout IndicatedY generallyat `Il) is a drillslowii positioned tiri a' Weir f2'. s 1dab1'e'tnepip'e'isan instrument I4., s'u'ch'` as a carriera orrecordrigdvica to which 'the' device 'I6- of the present' vrition may" be' attached. 'The' device V'r'icli'i cylindrical 'body' 'of y dia'rjie'ter" less than the `p having' 'threaded ex'ltens'ifns IB'for detaehably se*- ciiigthe bd'y' tof-'the instrument;

.The cylindrical body 'inclidesdam'etricall'y' opf- 1poseo, right" triangular" recesses 20"and djacent the upper end 24 thereof, the body including vertical wells 26 and 28 entering into the recesses. Slidable in the recesses are right triangular blocks 30 and 32 each having teeth 34 adapted to grippingly engage the inner face of the pipe III. Coil springs 36 and 38 are received in the wells and abut the bases'of the gripping blocks normally urging them upwardly and outwardly of the body and into gripping engagement with the pipe.

The cylindrical body is provided with diametrically opposed, relatively wide S-shaped slots 46 and 42 portions of which extend through the wall of the body as at 44 and 46. A pair of S-shaped lever arms 48 and 50 are received in the slots. the arms having relatively long bowed portions 52 and 54 adapted to extend through the slot portions 44 and 46. The construction of the lever arms are shown in Figures 8 and 9, and itY will be seen that the arms have hook portions 56 and 58 at their upper ends which are received in slots 60 and 62 in the gripping blocks 30 and 32, the slots extending through the hypotenuse of said blocks. The arm 48 has an arcuate slot 64 for receiving a reduced portion 66 in the other arm 5I). The body I6 is provided with a diagonal recess 68 which receives a pin I0 that extends through aligned apertures I2 and 'I4 in the arms 48 and 50. Thus the lever arms are pivoted intermediate their ends on the pin 16. The lever arms are provided with lugs I6 which receive the ends of a coil spring 18 which is interposed between the lever arms, the spring extending through a transverse bore in the body I6. The spring normally urges the lever arms apart.

In practical operation, the body I6 is attached y to an instrument I4 via the threaded lugs I8. vAs

the body slides through the pipe I6, the wall of the pipe presses against the portions 52 and 54 of the lever arms urging them inwardly against action of the spring 18. As the lever' arms iov inwardly, the hooked ends 56 and 58 press downwardly on the gripping blocks moving them inwardly and away from the wall of the pipe. When the portions 52 and 54 of the leverrarms clear the bottom free edge 82 of the pipe, the spring 18 forces the lever arms outwardly whereupon the hooked ends 56 and 58 allow the gripping blockstcnmoveupwardlyV and outwardly olf the block-land into gripping engagement with the inner wall of the pipe preventing falling out or loss oi the instrument I4.

In view of the foregoing descriptiontaken conjunction with the accompanying 'drawingsiiti is believed that a clear understanding of `the device will be quite apparent to those skilled inthis ,3. art. A more detailed description is accordingly deemed unnecessary.

It is to be understood, however, thatr evenV though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully compreli'ended 'byl the spirit of the inventionv as herein described and the scopeof the appended claims. Having described the invention, what is claimed as new is:` o y v f '1.'Infcombination with an object slidably positioned in a' tube, a device for preventing the object from dropping out of the end of the tube comprising a cylindrical body, means for attaching the body to the object, tube gripping means carried by 'said body, resilient means normally urging said members outwardly of said body and into gripping engagement with the inner wall of the tube".v andlever means operatively connected 35 l 2,251,125

to said gripping members urging said members inwardly and out of gripping contact with said tube by engagement of said lever means with the inner wall of said tube, said lever means including S-shaped arms having hooked upper ends pivoted intermediate their ends, said gripping members including slots receiving the upper ends of said arms, said hooked upper ends urging said gripping members inwardlyv of said body upon compression of said arms by said tube.

2. The combination of claim 1 and a resilient lmeans between said arms beneath the pivot norin mally urging said arms apart. 3. The combination of claim 2 wherein said body includes diagonally opposed right-triangular recesses adjacent its upper end, said gripping members including right-triangular blocks slidable in said' recesses, said blocks having gripping teeth.' I

4. The combination of claim 3 wherein said resilient means includes coil springs retained in said body each abutting the base of each gripping block. CHESTER M. HOLDER.;

MORGAN C. HOLDER;

REFERENCES CITED The following references are of record in the iile of this -patent: l

UNITED STATES PATENTS Number Name Date 1,218,549 Guiberson, Jr Mar. 6, 1917 2,193,183 Watts Mar. 12, 1940 Gardner July 29, 1941 

